> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sonarx.com/llms.txt
> Use this file to discover all available pages before exploring further.

# API Overview

> SonarX provides REST APIs for querying wallet balances and token holdings across EVM chains and Solana.

Query on-chain wallet balances and token holdings with support for both **real-time** and **historical (point-in-time)** data.

## Base URL

```
https://api-gateway.sonarx.com
```

## Authentication

All requests require an API key in the `apikey` header.

***

<CardGroup cols={2}>
  <Card title="EVM Token Balances" icon="ethereum" href="/api-reference/evm/get-wallet-holdings">
    Query token balances across **21 EVM chains** including Ethereum, Arbitrum, Base, Polygon, and more. Supports current balances and point-in-time queries by block number.
  </Card>

  <Card title="Solana Balances" icon="coins" href="/api-reference/solana/get-sol-balance">
    Query SOL and SPL token balances with **historical snapshots** at 10-minute intervals or **real-time** data directly from Solana RPC.
  </Card>
</CardGroup>